Improvement in lateral-motion center-pins for railway trucks



P Mrnrrr @rrrcn ROBERT B. JEWELL, OF DUNKIRK, NEW YORK.

IMPROVEMENT IN LATERAL-MOTION CENTER-PINS FOR RAILWAY TRUCKS.

Specification forming part of Letters Patent No. 119,150, datedSeptember 19, 1871.

vision is primarily intended and adapted for locomotive pilot-trucks. Itconsists, in part, of a center-pin with a divided and recessed member,(preferably the upper or male part.) The opposing surfaces of the saidrecess are corrugated or toothed, andthe lower is made to form twodoubleincline depressions, the whole being horizontal longitudinally andparallel with the longitudinal axis of the truck. Apair of corrugated ortoothed rollers, occupying, in normal position, the lowest points insaid depressions, and supporting the upper section, completes thedevice. The rollers permit the lateral motion, and, by ascending theinclines, to which they cling by the corrugations, take up the force ofmomentum and store power to return the truck to central position bygravity, the resistance incident to the construction serving to hold thehead steady on a straight track in the case of a locomotive. y Beinginclosed, the rollers are protected from dust and may be read' ily keptlubricated. g

Figure 1 is a plan of my improved center-pin with the cap or uppersection removed. Fig. 2 is avertical longitudinal section of the samecomplete, showing, by full and dotted lines, the normal positions of theparts and those they assume in turning a sharp curve. Fig. 3 is avertical transverse section.

Like reference letters indicate corresponding parts inthe severalfigures.

A represents an ordinary female center-pin. B is the base, and C the capof a horizontally-divided male center-pin,f1tted to and resting in thesocket of the female part A. D D are corrugated rollers separating thebase B and cap C of the male center-pin. z represents a recess formedjointly in the base B and cap C to receive the said rollers D, y y, apair of longitudinal doubleincline depressions 'in the iioor of saidrecess 5 and a' a', parallel corrugations in said depressions, and onthe opposing surface of the cap C, to engage with those of the saidrollers. The several parts may be cast of complete form of iron. 1naddition to the recesses z supplemental recesses w o are formed in therollers D and center-pin proper or pivot, to secure lightness. Theangles of the depressions y are so regulated as to be suficient to keepthe head of a locomotive steady on a straight track.

The respective parts may be attached to the truck and body-frame in anyapproved manner. When the leading wheels of atruck having my improvedcenter-pin enter a curve and the flanges press the outer rail, the truckis thrown laterally relatively to the body-frame, the motion beingpermitted by the divided centenpin and rollers or rockers, and the curveis passed with perfect freedom. When on a sharp curve thelrollers assumethe position indicated by dotted lines in Fig. 2. The position reachedvaries according to the nature of the curve. As the lateral pressure isremoved by the trucks reachrollers, or provided with an equivalentthereof, Vsubstantially as specified, for the purpose set forth.

R. B. JEWELL.

Witnesses:

WM. H. WYMAN,

L. C. JEWELL.- (20.)

